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<br />, .' GLOSSARY OF TERMS <br /> <br />generally drawn to show surface elevation for the crest of a <br />specific flood, but may be prepared for conditions at a given time <br />or stage. <br /> <br />Flood <br /> <br />An overflow on lands not normally covered by water and <br />that are used or usable by man. Floods have two essential char- <br />acteristics: (I) the Inundation of land Is temporary; and (2) <br />the land Is adjacent to and I nundated by overflow from a river, a <br />stream, an ocean, a lake, or other, body of standing water. <br /> <br />Flood Staqe <br />The stage of elevation at which overflow of the natural <br />banks of a stream or body of water begins In the reach or area In <br />which the elevation Is measured. <br /> <br />Nonmally~ a flood Is considered as any temporary rise In <br />streamflow or stage, but not the pondlng of surface water, that <br />results In significant adverse effects In the vicinity. Adverse <br />effects may Include damages from overflow of land areas, temporary <br />backwater effects In sewers and local drainage channels, creation <br />of unsanitary conditions or other unfavorable situations by deposi- <br />tion of materials In stream channels during flood recessions, rise <br />of ground water coincident with increased streamflow, and other <br />problems. <br /> <br />Head Loss <br />The effect of obstructions, such as narrow brldge'open- <br />Ings or buildings, that limit the area through which water must <br />flow, 'ralslng the surface of the water upstream from the obstruc- <br />tion. . \ <br /> <br />Left Bank <br />- <br />The bank on the left side of a river, stream, or water <br />course looking downstream. <br /> <br />Flood Crest <br /> <br />The maximum stage or elevation reached by the waters of <br />a flood at a given location. <br /> <br />Reference Point <br />A numbered point Identifying a specific 19Catlon used <br />for correlating the data shown In various forms throughout the <br />report. <br /> <br />Flood Plain <br /> <br />The relatively flat area or low lands adjoining the chan- <br />,nel of a, river,' stream, water course, ocean, lakll, or other body <br />of standing water which has been or may be covered by floodwater. <br /> <br />RlqhtBank <br />The bank on the right side of a river, stream, or water <br /> <br />course looking downstream. <br /> <br />Flood Profile <br />A graph shOWing the relationship of water surface eleva- <br />tion -todocatlon, the latter generally expressed as distance above <br />mouth <'for. a' stream of 'water f lowing In an open channel. . It Is <br /> <br />10-, 50-. 100-. and 500-Year Flood <br />A flood having a 10, 2, I, or .2 percent probability, <br />respectively, of occurrence In any yoaror jln average frequency <br />of occurrence In the'orderaf once: In' 10, 50., 100, or 500 years, <br /> <br />27 <br /> <br />26 <br />